Bulbophyllum Lamb, Spec
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BLUMEA 38 (1994) 335-348 Notes on Bulbophylunae(Orchidaceae) from Borneo J.J. Vermeulen & A. Lamb Summary all and one ofthe Trias are described, originat- Nine new species of the genus Bulbophyllum genus are ing from Borneo. Notes on two more Bornean species of Bulbophyllum given. additional the informationon BorneanBulbophyllum species given This paper is to The Trias is in Vermeulen (1991). It adds nine new species to the checklist. genus Two other Bulbo- recorded for the first time from Borneo, with one new species. have been reduced into phyllum species are mentionedwhich appear to incorrectly synonymy in Vermeulen (1991). 1. Bulbophyllum habrotinum J. J. Vermeulen & A. Lamb, spec. nov. (sect. Cirrhopetalum) — Fig. 1 adaxialiter Bulbophyllum habrotinumJ.J. Vermeulen & A. Lamb, a B. makoyano in labello verru- — Leiden cult. (De 913245 (L). coso differt. Typus: Vogel) 1-2.5 0.9-2.8 Rhizome creeping, 2.5-3 mm diam.Pseudobulbs ovoid, cm apart, Petiole 5-10 7- by 0.6-1.1 cm, somewhat flattened or not. mm. Leaf blade elliptic, index obtuse. 4.5-9 20 by 2-3 cm, 3.5-10, tip Inflorescence usually single, cm, 8 Rhachis 6-9-flowered. Peduncle 4.3-8.7 cm; bracts c. 4, the longest c. mm. Floral bracts 4-5 Pedicel and nodding, 0.2-0.3 cm. ovate, mm, tip acute. ovary Flowers in all the little 6-7 mm. pendulous, a whorl, open at same time, opening. 3.5-4 index often Median sepal elliptic, 4.2-4.5 by mm, 1.1-1.3, tip acuminate, rather thin; surface Lateral with a terminal hair; margins long ciliate; glabrous. sepals well their lower in the basal connate along their upper margins as as along margins rather third, obliquely ovate, 26-55 by 3-3.5 mm, index c. 9-16, tip subacute; thin; about glabrous. Petals obliquely ovate, 4-4.5 by 2-2.5 mm, index 1.8-2, tip rather acuminate, often with a terminal hair; margins long ciliate; thin; adaxially very finely papillose towards the tip; abaxially glabrous. Lip curved halfway, general index 1.7-2 acute to outline ovate, 3.2-4 by 1.8-2 mm, (not spread), tip shortly towards the rather acuminate; margins finely erose, papillose tip; thin, soft; adaxially with median with 2 distinct conver- concave near the base, an inconspicuous ridge, of its towards the base small lobes, gent ridges over most length, protruding as sur- face papillose towards the base, verrucate towards the margins elsewhere; abaxially 1 ) Rijksherbarium/Hortus Botanicus, P.O. Box 9514, 2300 RA Leiden, The Netherlands. 2 ) Agricultural Research Station, P.O. Box 197, Tenom, Sabah, Malaysia. 336 BLUMEA Vol. 38, No. 2, 1994 Fig. 1. Bulbophyllum habrotinum J.J. Vermeulen & A. Lamb. a. Flower; b. lip, adaxial side; d. column and lip, lateral view (Leiden cult. 913245). — Fig. 2. B. trulliferum J.J. Vermeulen & A. Lamb. a. Flower analysis, from left to right: median sepal, petal, lateral sepal, lip; b. lip, adaxial side; c. column and lip, lateral view (T. O. C. cult. 2321). — Fig. 3. B. gilvum J.J. Vermeulen & A. d. lateral view ( Vermeulen Lamb. a. Plant; b. lip, adaxial side; column and lip, 569). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 337 with median surface Column from the a distinct, retuse ridge, glabrous. ovary to tip ofthe stelidia c. 2 mm; stigma not protruding at its base, slit-like; column foot with- out accessories. Stelidia deltoid, c. 0.5 mm; tip acute; with a distinct, deltoid, acute with towards tooth along the upper margin. Anther abaxially an inconspicuous ridge its tip; front margin protruding. Pollinia 4; the innerpair more than half as long as the outer pair. Stipes absent. Colours - Peduncle pale red, bracts pale green, sometimes with a pink tinge. Pedicel orange red, ovary yellow with red stripes. Median sepal dark red. Lateral se- Petals pals yellow, mottled with dark red, dark red towards the top. yellowish green, brown. veins and top dark red. Lip yellow, suffused with some Distribution - Malaysia: Sabah, Interior Zone: Crocker Range near Tambunan, Lamb 1337/91 (L). Indonesia: Kalimantan, Kalimantan Timur, Apo Kayan, Leiden cult, (de Vogel) 913245(L). Ecology - Epiphyte in primary forest. Alt. 1000-1500m asl. Flowering observed in March. Notes - Differs from B. makoyanum (Reichb. f.) Ridley in having a lip which is verrucose adaxially. In addition, it has lateral sepals which are not covered with a the flowers and which their sticky mucus when are open, are only connate along the base. lower margins near The name refers to the elegandy shaped flowers: 'habros' (Greek) meaning 'deli- cate'. 2. Bulbophyllum trulliferum J. J. Vermeulen & A. Lamb, spec. nov. (sect. Hirtula) — Fig. 2 Bulbophyllum trulliferum J.J. Vermeulen & A. Lamb, a B. nigrescenti in inflorescentia nutanti, petalis triangularibus differt. — Typus: T. O. C. cult. 2321 (L). Rhizome creeping, 1.8-2.5 mm diam.Pseudobulbs almost discoid, 0.6-1 cm apart, 0.4-0.7 by 1.2-2 cm, distinctly dorsoventrally flattened. Petiole c. 10 mm. Leaf blade elliptic, 8.5-17 by 0.8-1.2 cm, index 10-14.2, tip acute. Inflorescence 29-32 10-14-flowered. 27-29 bracts the usually single, cm, Peduncle cm; c. 5, longest c. 5 mm. Rhachis nodding, 2-3 cm. Floral bracts ovate, 1 mm, tip acute. Pedicel and 2.5-3 node with the attachment of the floral ovary mm, coinciding bract. Flowers scattered, many open simultaneously, little opening. Median sepal rounded ovate, 3-3.2 by 2-2.6 mm, index 1.2-1.5, tip to obtuse; margins ciliate; rather thin; adaxially glabrous, abaxially hirsute. Lateral sepals oblique, 3-3.8 by 2-3 mm, index 1.3-1.5, tip obtuse; margins papillose; otherwise as the median sepal. Petals oblique, triangular, 1.5-2.5 by 0.5-0.7 mm, index 3-3.6, tip sub- acute; margins long ciliate; thin; surface glabrous. Lip distinctly curved halfway, constricted general outline obovate, somewhat halfway, 2-2.5 by 1.1—1.2 mm, ciliate index 1.9-2.1 (not spread), tip rounded; margins long and with a backwards pointing, subulate auricle near the attachmentto the column; thick; adaxially concave near the base, with 2 short ridges continuing as a slight median depression which is flanked by 2 more rather distinctridges, and which ends as a circular depression near the top of the lip, surface glabrous; abaxially without a median ridge, surface hairs. Column from towards the margins with thick long ovary to the tip of the 338 BLUMEA Vol. 38, No. 2, 1994 stelidia c. 1.6 mm; stigma protruding at its base, triangular; column foot without Stelidia 1 with accessories. narrowly triangular, c. mm; acute; a small, deltoid, ob- tooth the and much tooth of similar tuse along upper margin a larger shape along the lower margin. Anther abaxially without a ridge; front margin not protruding, with stiff hairs. Pollinia 4; the innerpair more than half as long as the outer pair. Stipes absent. Colours - Sepals cream-coloured, suffused with pale purple. Petals white, vein, margin and hairs along the margin purple. Lip orange towards the base, blackish the hairs white. purple towards top; Distribution - Malaysia: Sabah, Interior Zone: Crocker Range near Tenom, Lamb 830/87 (K), T.O.C. cult. 2321 (L), T.O.C. cult. 2429. Ecology - Epiphyte in primary forest. Alt. c. 900 m asl. Flowering observed in Sept. Notes - 1. Shares a concave top part of the tip with B. nigrescens Rolfe. It differs from that species in having a nodding rhachis, triangular (not spathulate) petals, as well as much longer and narrower stelidia. 2. The name refers to the shape of the lip: 'trulla' meaning 'spoon' inLatin. 3. J. J. Vermeulen & A.Lamb, Bulbophyllum gilvum spec. nov. (sect. Lepto- pus) — Fig. 3 Bulbophyllum gilvum J.J. Vermeulen & A. Lamb, a B. tenuifolio pseudobulbis dense aggregatis, labello recurvato differt. — Typus: Vermeulen 569 (L). 0.8 diam. 0.08-0.2 0.15- Rhizome creeping, c. mm Pseudobulbs ovoid, cm apart, 0.5 0.08-0.18 flattened.Petiole 0.5-1 blade 1.5- by cm, hardly mm. Leaf elliptic, 3.4 by 0.3-0.35 cm, index 5-10, tip acute. Inflorescence usually few together on a short sympodium, 2-3 cm, 1-flowered. Peduncle 1-1.8 cm; bracts 2, the longest 1- 1.8 mm. Floral bracts tubular, 1-1.5 mm, tip acute. Pedicel and ovary c. 8 mm, with the node c. 0.6 mm from the floral bract. Flowers moderately opening. Mediansepal ovate, c. 6.3 by 2.2 mm, index 2.8-2.9, tip acute; rather thin; glabrous. Lateral se- 6.7 2.4 index otherwise the median pals oblique, c. by mm, c. 2.8; as sepal. Petals 2.2 1.2 index obliquely obovate, c. by mm, 1.8-1.9, tip obtuse; margins finely pa- surface outline pillose; thin; glabrous. Lip curved halfway, general ovate, c. 3.2 by 1.2 mm, index 2.6-2.7 (not spread), tip rounded; margins partially papillose in the lower half of the lip, otherwise glabrous; rather thick; adaxially concave and with 2 convergent ridges near its base, elsewhere slighdy convex, surface glabrous; abaxi- ally with an inconspicuous, truncate median ridge near the base, surface with a trans- verse papillose band in the basal half. Column from ovary to the tip of the stelidia c. 1.3 mm; stigma not protruding at its base, obovate; column foot with small lateral wings close to the attachment of the lip.